Uninterruptible power supply



FIG. 1 is a perspective view of “uninterruptible power supply” showing our new design thereof;

FIG. 2 is a right side elevational view;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front side elevational view;

FIG. 5 is a bottom plan view;

FIG. 6 is left side elevational view; and,

FIG. 7 is a rear side elevational view. 

The ornamental design for “uninterruptible power supply”, as shown and described. 